package com.lagou.coder;

import com.lagou.ser.Serializer;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;

import java.util.List;

public class RpcDecoder extends ByteToMessageDecoder {

    private Class<?> clazz;
    private Serializer serializer;

    public RpcDecoder(Class<?> clazz, Serializer serializer) {
        this.clazz = clazz;
        this.serializer = serializer;
    }


    @Override
    protected void decode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> list) throws Exception {
        if (byteBuf != null && byteBuf.isReadable() && byteBuf.readableBytes() > 4) {
            byte[] data = new byte[byteBuf.readInt()];
            byteBuf.readBytes(data);
            list.add(serializer.deserialize(clazz, data));
        }
    }
}
